Switchblade knife



FIG. 1 is a perspective view of a switchblade knife showing the new design;

FIG. 2 is a front elevation view thereof

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a left side elevation view thereof; and,

FIG. 7 is a right side elevation view thereof.

The broken lines depict portions of the switch blade knife in which the design is embodied that are not considered part of the claimed design. 

CLAIM The ornamental design for a switchblade knife, as shown and described. 